Fuse



1. H. BRADNACK.

FUSE.

APPLICATION FILED FEB. 19, l9l9 1396,9238. Patented Nov. 15, 1921.

@931, 7 2 I x I. 27 5 v 28 27 xe e e.

JOHN H. BRADNACK, OF NEW HAVEN, CONNECTZGUT.

Specification of Letters Patent.

FUSE.

Patented Nov.15, 1921.

Application filed February 19, 1919. Serial No. 278,042.

- ,To w from it may concern Be it known that I, JOHN H. BKADNACK, acitigen of the United States. residing at New Haven, hr the county ofNew Haven and State of Connecticut, have invented a new andiusefulImprovement in F uses; and I do hereby declare the following, when takenin connectionwith the accompanying drawings ,andthe;;cliaracters ofreference marked thereon,-to,be a. full, clear, and exact descrip-.tion.,o'f the-.same, and which said drawings constitute part. of thisapplication, and represent,;-in.---

Figure 1a side view of a fuse constructed in accordance with myinvention. 2:7: 2-:a'n end'view of the same.

Fig. 3 a sectional view on the line 3-3 of Fig-.-;1;r

Fig. 4- an end view with the cap removed. Fig: Swan enlarged transversesectional viewiofv one end of the fuse.

Fig. 6 a sectional view on the line 66 of of Fig.5..

Fig. 7 a side view of one form of cap used in connection with my fuseand shown 1n connection with one of the fuse bars. I

Fig. 8 a side view illustrating a modified form of cap and clip.

Fig. 9v a top or plan view of the same. Fig. 10 a transverse sectionalview lllustrating a modified form of collar.

Fig. 11 an end view of a fuse illustrating another means for securingthe bars in the collars.

This invention relates to an improvement in fuses for electricinstallation, and particularly to fuses of the so called cartridge type,that is, a fuse which consists of a tubular casing of paper or othersuitable fibrous material, with caps applied to the ends thereof, andmeans for supporting a fuse within the tube 'so that contacts may bemade at opposite ends thereof, the objectof the invention being toproduce a fuse at a low cost for manufacture by which a fuse strip maybe readily replaced as required, and thefuse inspected, if necessary;and the invention consists in the construction hereinafter described andparticularly recited in the claims.

In carrying out my invention, I employ a tube 12 of paper or otherfibrous material. Applied to opposite ends of this tube are col lars 13and 14 formed from metal and connected with the ends of the tube in anydesired manner, either by spinning the edge of the collars into the tubeas shown in Fig. 3

of the drawings, or by threading the collars and turning them onto thetube as indicated in Fig. 10 of the drawings. In each of the collars isa transverse bar 15. These bars may be secured in any desired manner.Thus as shown in Figs. 3 and 5 of the drawings the collarsv may beformed on opposite sides with vertical grooves 16 in which the ends ofthe bars extend, the bars resting upon the. ends of the tube on whichthey may be held by turningthe opposite edges of the collars inward.Preferably and as shown the bars are formed with inward extensions 18.The usual fuse strips 19 are inserted into the tubes and the ends foldedover the bars. The ends of the fuse are closed by caps 20 provided withinwardly extending spring fin gers 21 which are adapted to pass onopposite sides of the bar so as to firmly hold the fuse strip inconnection therewith. These clips will preferably be formed as shown inFig. 7 of the drawings so as to provide spring clips with upwardlyextending fingers 22, although single finger clips may be employed asshownin Fig. 8 of the drawings, in which the clip is formed from a stripof metal folded to form two gripping fingers. 23, these fingers beingsecured to the cap plate 20 by means of a clip 24. Preferably and asshown in Fig. 2, the cap plates will be formed on opposite sides withlips 27 which extend into the finger openings formed by turning in theedges in the collars. Instead of turning the opposite edges of thecollars inward, the. opposite edges may be formed with notches 28 asshown in Fig. 10 0f the drawings, the object of the turned in portionsand notches being to provide clearance for the fingers in removing theclips, and the bars may extend at right angles to the notches or so asto intersect the notches as indicated in Fig. 11 of the drawings; andinstead of having the ends of the bars extend into grooves in thecollars, the ends 26 of the bars may be bent in opposite directions andsecured in the collars by soldering or other wise. If desired, and asindicated in Fig. 6, the ends of the casingmm ifi be slotted to receivethe lower edges oi tie. bars which prevent the collars from turning.lVith this construction, as stated, the ends of the fuse maybe readilyfolded over the ends of the bars so as to electrically connectthe sameand the caps inserted to close the ends of the. tube, the fingers oftheelips holding the fuse in close contact with the bars and mak- Y ingelectrical connection between the two caps. Should it be desired toinspect the fuse one of the caps may be readily removed, and in case thefuse is broken, a portion of the fuse will be removed with the cap beinggripped by the clip so that if a portion of the fuse comes out with theclip, it indicates at once that the fuse is broken. On the other hand,if the cap is removed without bringing a portion of the fuse with it, itindicates that the fuse is intact. These caps or clips are readilyremoved with the fingers and do not require the application of any toolto them for that purpose.

I claim 1. A fuse comprising a tube, collars permanently secured toopposite ends of the tube, bars extending transversely to said collars,and caps closing the ends of the tubes and formed with inwardlyprojecting clips adapted to straddle the said bars.

2. A fuse comprising a tube having its ends slotted on opposite sides,collars permanently secured to opposite ends of the tube, bars extendingtransversely to said collars and adapted to enter the slots in the tube,and caps closing the ends of the tubes and formed with inwardlyprojecting clips adapted to straddle the-said bars.

3. A fuse comprising a tubular casing, collars secured to opposite endsthereof, said collars formed on opposite sides with finger openings,transverse bars in said collars, caps adapted to close the ends of thefuse, said cap provided with inwardly projecting spring fingers adaptedto straddle said bars.

collars secured to opposite ends thereof, said collars formed onopposite sides with finger openings, transverse bars in said collars,caps adapted to close the ends of the fuse, said cap provided Withinwardly projecting spring fingers adapted to straddle said bars, andwith lips on opposite sides extending into said finger openings.

5. A fuse comprising a tubular casing, collars connected with oppositeends of the casing, said collars formed with vertical grooves,transverse bars in said collars the ends ofwhich enter said grooves,caps adapted to close the ends of the fuse and pro vided with inwardlyprojecting spring fin gers adapted to straddle the said bars.

6. A fuse comprising a tubular casing, collars permanently connectedwith the 0pposite ends of the casing beyond which they project, oppositeouter edges of the collars struck inward, a transverse bar connectedwith said collars, caps adapted to close the ends of said fuse andprovided with inwardly projecting spring fingers adapted to straddlesaid bars.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

- JOHN H. BRADNACK. Witnesses FREDERIC (l. EARLE, CLARA L. WEED.

4. A fuse comprising a tubular casing,.

